John ellboj



J. ELLBOJ.

METHOD OF CASTING GROOVES 0R lMPRESSIONS IN ROLLERS.

APPLICATION FILED MAR.1. I919.

Patented July 8, 191 9.

UNITED STATES PATENT OFFICE.

JOHN ELLIBOJ, F STOCKHOLM, SWEDEN.

METHOD OF CASTING GBOOVES OR IMPRESSIONS IN ROLLERS.

Application filed March 7, 1919.

To all whom it may concern Be it known that I, Join: ELLnoJ, engineer, residing at Stockholm, Sweden, have invented certain new and useful Improvements in Methods of Casting Grooves or Impressions in Rollers, of which the following is a specification.

When casting grooves in chill molds the shrinkage of the metal after the casting has CttllSGtl great inconveniences, as the chills between then'iselves have not followed the shrinking of the metal, so that shrink cracks have arisen in the articles being made. In order to obviate this inconvenience according to the resent method the chills are secured togetlier by means of hinges or fastenings, made of thin flat or hoop iron, of such strength that owing to their slight power of resistance they do not cause an obstacle to the shrinking, when the metal contracts after casting.

Figure 1. on the accompanying drawing illustrates such an arrangement for casting chill hardened grooves in a chill hardened pig iron roller. a, a are rings of iron of the size and shape corresponding to the shape of the grooves to be made in the roller, and said rings are secured in at suitable distances from one another by hinges b, b, which again are secured to a cylinder 0 of the same diameter the rings. Said cylinder which at the same time serves as a crucible, together with the hinges and the rings forms a skeleton, which then is submerged in the casting mold.

Fig. 2 shows the arrangement in plan.

" Fig. 3 shows the skeleton according to Fi 1, submerged in a common chill mold (Z, (Z for the casting.

Fig. l is a part view of the skeleton submerged in the chill mold, with a cylindrical packing or lining of asbestos placed in position.

Fig. 5 is a plan view of one of the rings made in halves according to a modification which is used when the rings are intended to be used repeatedly.

The mold in which the skeleton is sub merged or laid down need not to be a chill mold, but can be any common casting mold.

In order to establish a better tightening and prevent the metal from penetrating between the chill molds and the casting mold a packing cylinder or lining c of asbestos or 5 any other suitable the proof material may Copies of this patent may be obtained for Specification of Letters Patent.

Patented July 8, 1919.

Serial No. 281,193.

be used. The lining is placed between the .ring (6 and the chill mold (Z, as is shown in Fig. 4.

Said rings or other closed chill molds which are intended to be used repeatedly are made in halves or in several parts in such a manner, that they can be taken to pieces and again put together when desired as is shown in Fig. 5.

Having now particularly described my invention and ascertained in what manner the same is to be performed, what I claim is:

1. The method of casting grooves or impressions in rollers in chill molds, consisting in securing the chills together in a suitable distance from one another by means of thin hinges or fastenings of thin flat or hoop iron, so as to form a jointed skeleton.

2. The method of casting grooves or impressions in rollers in chill molds, consisting in securing the chills together at a suitable distance from one another by means of thin hinges or fastenings of thin flat or hoop iron, so as to form a ointed skeleton. securing said skeleton to a cylinder, and submerging said cylinder in a casting mold.

3. In a device for casting grooves or impressions in rollers in chill molds the combination with the chills of thin flat or hoop iron, secured to the chills and to a cylinder of the same diameter as the chills, and a casting mold, in which said cylinder is submerged.

4.. In a device for casting grooves or impressions in rollers in chill molds the combination of a skeleton, made of the chill molds and thin flat or hoop irons, to which the chills are hinged, a cylinder, to which said skeleton is secured, a casting mold, in which said cylinder is submerged, and tightening means between the chills and the casting mold.

5. In a device for casting grooves or impressions in rollers in chill molds the combination of chills, made in several parts, and hinged together so as to form a skeleton, a cylinder, to which said skeleton is secured, and a casting mold, in which said cylinder is submerged.

In testimony whereof I have signed my name to this specification.

JOHN ELLBOJ.

Witnesses:

A. BIORCK, G. Nn'rrnnmn'r.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

